*: fix revive linter

scripts/test.sh

@@ -433,11 +433,6 @@ function lint_fix_pass {
   run_for_modules generic_checker run golangci-lint run --config "${ETCD_ROOT_DIR}/tools/.golangci.yaml" --fix
 }
 
-function revive_pass {
-  # TODO: etcdserverpb/raft_internal_stringer.go:15:1: should have a package comment
-  run_for_modules generic_checker run_go_tool "github.com/mgechev/revive" -config "${ETCD_ROOT_DIR}/tests/revive.toml" -exclude "vendor/..." -exclude "out/..."
-}
-
 function unconvert_pass {
   # TODO: pb package should be filtered out.
   run_for_modules generic_checker run_go_tool "github.com/mdempsky/unconvert" unconvert -v

server/etcdserver/api/membership/cluster.go

@@ -873,7 +873,7 @@ func (c *RaftCluster) Store(store v2store.Store) {
 			zap.Bool("is-learner", m.IsLearner),
 		)
 	}
-	for id, _ := range c.removed {
+	for id := range c.removed {
 		//We do not need to delete the member since the store is empty.
 		mustAddToRemovedMembersInStore(c.lg, store, id)
 	}

tests/common/auth_util.go

@@ -104,11 +104,7 @@ func setupAuth(c interfaces.Client, roles []authRole, users []authUser) error {
 	}
 
 	// enable auth
-	if err := c.AuthEnable(context.TODO()); err != nil {
-		return err
-	}
-
-	return nil
+	return c.AuthEnable(context.TODO())
 }
 
 func requireRolePermissionEqual(t *testing.T, expectRole authRole, actual []*authpb.Permission) {

tests/e2e/cmux_test.go

@@ -91,14 +91,14 @@ func TestConnectionMultiplexing(t *testing.T) {
 					name = "ClientTLS"
 				}
 				t.Run(name, func(t *testing.T) {
-					testConnectionMultiplexing(t, ctx, clus.Procs[0], clientTLS)
+					testConnectionMultiplexing(ctx, t, clus.Procs[0], clientTLS)
 				})
 			}
 		})
 	}
 }
 
-func testConnectionMultiplexing(t *testing.T, ctx context.Context, member e2e.EtcdProcess, connType e2e.ClientConnType) {
+func testConnectionMultiplexing(ctx context.Context, t *testing.T, member e2e.EtcdProcess, connType e2e.ClientConnType) {
 	httpEndpoint := member.EndpointsHTTP()[0]
 	grpcEndpoint := member.EndpointsGRPC()[0]
 	switch connType {

tests/e2e/utils.go

@@ -71,9 +71,8 @@ func tlsInfo(t testing.TB, cfg e2e.ClientConfig) (*transport.TLSInfo, error) {
 				return nil, fmt.Errorf("failed to generate cert: %s", err)
 			}
 			return &tls, nil
-		} else {
-			return &integration.TestTLSInfo, nil
 		}
+		return &integration.TestTLSInfo, nil
 	default:
 		return nil, fmt.Errorf("config %v not supported", cfg)
 	}

tests/e2e/watch_delay_test.go

@@ -122,9 +122,8 @@ func TestWatchDelayForManualProgressNotification(t *testing.T) {
 					if err != nil {
 						if strings.Contains(err.Error(), "context deadline exceeded") {
 							return nil
-						} else {
-							return err
 						}
+						return err
 					}
 					time.Sleep(watchResponsePeriod)
 				}
@@ -155,9 +154,8 @@ func TestWatchDelayForEvent(t *testing.T) {
 					if err != nil {
 						if strings.Contains(err.Error(), "context deadline exceeded") {
 							return nil
-						} else {
-							return err
 						}
+						return err
 					}
 					time.Sleep(watchResponsePeriod)
 				}
@@ -204,9 +202,8 @@ func continuouslyExecuteGetAll(ctx context.Context, t *testing.T, g *errgroup.Gr
 				if err != nil {
 					if strings.Contains(err.Error(), "context deadline exceeded") {
 						return nil
-					} else {
-						return err
 					}
+					return err
 				}
 				respSize := 0
 				for _, kv := range resp.Kvs {

tests/framework/e2e/etcd_process.go

@@ -133,8 +133,8 @@ func (ep *EtcdServerProcess) EndpointsHTTP() []string {
 }
 func (ep *EtcdServerProcess) EndpointsMetrics() []string { return []string{ep.cfg.MetricsURL} }
 
-func (epc *EtcdServerProcess) Etcdctl(opts ...config.ClientOption) *EtcdctlV3 {
-	etcdctl, err := NewEtcdctl(epc.Config().Client, epc.EndpointsGRPC(), opts...)
+func (ep *EtcdServerProcess) Etcdctl(opts ...config.ClientOption) *EtcdctlV3 {
+	etcdctl, err := NewEtcdctl(ep.Config().Client, ep.EndpointsGRPC(), opts...)
 	if err != nil {
 		panic(err)
 	}

tests/integration/clientv3/concurrency/session_test.go

@@ -58,7 +58,7 @@ func TestSessionTTLOptions(t *testing.T) {
 	}
 	defer cli.Close()
 
-	var setTTL int = 90
+	var setTTL = 90
 	s, err := concurrency.NewSession(cli, concurrency.WithTTL(setTTL))
 	if err != nil {
 		t.Fatal(err)

tests/integration/revision_test.go

@@ -87,15 +87,15 @@ func testRevisionMonotonicWithFailures(t *testing.T, testDuration time.Duration,
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			putWorker(t, ctx, clus)
+			putWorker(ctx, t, clus)
 		}()
 	}
 
 	for i := 0; i < 10; i++ {
 		wg.Add(1)
 		go func() {
 			defer wg.Done()
-			getWorker(t, ctx, clus)
+			getWorker(ctx, t, clus)
 		}()
 	}
 
@@ -109,7 +109,7 @@ func testRevisionMonotonicWithFailures(t *testing.T, testDuration time.Duration,
 	t.Logf("Revision %d", resp.Header.Revision)
 }
 
-func putWorker(t *testing.T, ctx context.Context, clus *integration.Cluster) {
+func putWorker(ctx context.Context, t *testing.T, clus *integration.Cluster) {
 	for i := 0; ; i++ {
 		kv := clus.Client(i % 3)
 		_, err := kv.Put(ctx, "foo", fmt.Sprintf("%d", i))
@@ -122,7 +122,7 @@ func putWorker(t *testing.T, ctx context.Context, clus *integration.Cluster) {
 	}
 }
 
-func getWorker(t *testing.T, ctx context.Context, clus *integration.Cluster) {
+func getWorker(ctx context.Context, t *testing.T, clus *integration.Cluster) {
 	var prevRev int64
 	for i := 0; ; i++ {
 		kv := clus.Client(i % 3)

tests/integration/v2store/store_test.go

@@ -543,7 +543,7 @@ func TestStoreCompareAndSwapPrevIndexFailsIfNotMatch(t *testing.T) {
 // TestStoreWatchCreate ensures that the store can watch for key creation.
 func TestStoreWatchCreate(t *testing.T) {
 	s := v2store.New()
-	var eidx uint64 = 0
+	var eidx uint64
 	w, _ := s.Watch("/foo", false, false, 0)
 	c := w.EventChan()
 	assert.Equal(t, w.StartIndex(), eidx)
@@ -564,7 +564,7 @@ func TestStoreWatchCreate(t *testing.T) {
 // can watch for recursive key creation.
 func TestStoreWatchRecursiveCreate(t *testing.T) {
 	s := v2store.New()
-	var eidx uint64 = 0
+	var eidx uint64
 	w, err := s.Watch("/foo", true, false, 0)
 	testutil.AssertNil(t, err)
 	assert.Equal(t, w.StartIndex(), eidx)

tests/robustness/failpoints.go

@@ -237,7 +237,7 @@ type goPanicFailpoint struct {
 }
 
 type trigger interface {
-	Trigger(t *testing.T, ctx context.Context, member e2e.EtcdProcess, clus *e2e.EtcdProcessCluster) error
+	Trigger(ctx context.Context, t *testing.T, member e2e.EtcdProcess, clus *e2e.EtcdProcessCluster) error
 	AvailabilityChecker
 }
 
@@ -270,7 +270,7 @@ func (f goPanicFailpoint) Inject(ctx context.Context, t *testing.T, lg *zap.Logg
 		}
 		if f.trigger != nil {
 			lg.Info("Triggering gofailpoint", zap.String("failpoint", f.Name()))
-			err = f.trigger.Trigger(t, ctx, member, clus)
+			err = f.trigger.Trigger(ctx, t, member, clus)
 			if err != nil {
 				lg.Info("gofailpoint trigger failed", zap.String("failpoint", f.Name()), zap.Error(err))
 			}
@@ -330,7 +330,7 @@ func (f goPanicFailpoint) Name() string {
 
 type triggerDefrag struct{}
 
-func (t triggerDefrag) Trigger(_ *testing.T, ctx context.Context, member e2e.EtcdProcess, _ *e2e.EtcdProcessCluster) error {
+func (t triggerDefrag) Trigger(ctx context.Context, _ *testing.T, member e2e.EtcdProcess, _ *e2e.EtcdProcessCluster) error {
 	cc, err := clientv3.New(clientv3.Config{
 		Endpoints:            member.EndpointsGRPC(),
 		Logger:               zap.NewNop(),
@@ -356,7 +356,7 @@ type triggerCompact struct {
 	multiBatchCompaction bool
 }
 
-func (t triggerCompact) Trigger(_ *testing.T, ctx context.Context, member e2e.EtcdProcess, clus *e2e.EtcdProcessCluster) error {
+func (t triggerCompact) Trigger(ctx context.Context, _ *testing.T, member e2e.EtcdProcess, clus *e2e.EtcdProcessCluster) error {
 	cc, err := clientv3.New(clientv3.Config{
 		Endpoints:            member.EndpointsGRPC(),
 		Logger:               zap.NewNop(),
@@ -399,7 +399,7 @@ type blackholePeerNetworkFailpoint struct {
 
 func (f blackholePeerNetworkFailpoint) Inject(ctx context.Context, t *testing.T, lg *zap.Logger, clus *e2e.EtcdProcessCluster) error {
 	member := clus.Procs[rand.Int()%len(clus.Procs)]
-	return f.Trigger(t, ctx, member, clus)
+	return f.Trigger(ctx, t, member, clus)
 }
 
 func (f blackholePeerNetworkFailpoint) Name() string {
@@ -410,8 +410,8 @@ type triggerBlackhole struct {
 	waitTillSnapshot bool
 }
 
-func (tb triggerBlackhole) Trigger(t *testing.T, ctx context.Context, member e2e.EtcdProcess, clus *e2e.EtcdProcessCluster) error {
-	return blackhole(t, ctx, member, clus, tb.waitTillSnapshot)
+func (tb triggerBlackhole) Trigger(ctx context.Context, t *testing.T, member e2e.EtcdProcess, clus *e2e.EtcdProcessCluster) error {
+	return blackhole(ctx, t, member, clus, tb.waitTillSnapshot)
 }
 
 func (tb triggerBlackhole) Available(config e2e.EtcdProcessClusterConfig, process e2e.EtcdProcess) bool {
@@ -421,7 +421,7 @@ func (tb triggerBlackhole) Available(config e2e.EtcdProcessClusterConfig, proces
 	return config.ClusterSize > 1 && process.PeerProxy() != nil
 }
 
-func blackhole(t *testing.T, ctx context.Context, member e2e.EtcdProcess, clus *e2e.EtcdProcessCluster, shouldWaitTillSnapshot bool) error {
+func blackhole(ctx context.Context, t *testing.T, member e2e.EtcdProcess, clus *e2e.EtcdProcessCluster, shouldWaitTillSnapshot bool) error {
 	proxy := member.PeerProxy()
 
 	// Blackholing will cause peers to not be able to use streamWriters registered with member
@@ -437,10 +437,9 @@ func blackhole(t *testing.T, ctx context.Context, member e2e.EtcdProcess, clus *
 	}()
 	if shouldWaitTillSnapshot {
 		return waitTillSnapshot(ctx, t, clus, member)
-	} else {
-		time.Sleep(time.Second)
-		return nil
 	}
+	time.Sleep(time.Second)
+	return nil
 }
 
 func waitTillSnapshot(ctx context.Context, t *testing.T, clus *e2e.EtcdProcessCluster, blackholedMember e2e.EtcdProcess) error {

tests/robustness/model/describe.go

@@ -99,9 +99,8 @@ func describeTxnResponse(request *TxnRequest, response *TxnResponse) string {
 	}
 	if response.Failure {
 		return fmt.Sprintf("failure(%s)", description)
-	} else {
-		return fmt.Sprintf("success(%s)", description)
 	}
+	return fmt.Sprintf("success(%s)", description)
 }
 
 func describeEtcdOperation(op EtcdOperation) string {
@@ -162,13 +161,12 @@ func describeRangeResponse(request RangeOptions, response RangeResponse) string
 			kvs[i] = describeValueOrHash(kv.Value)
 		}
 		return fmt.Sprintf("[%s], count: %d", strings.Join(kvs, ","), response.Count)
-	} else {
-		if len(response.KVs) == 0 {
-			return "nil"
-		} else {
-			return describeValueOrHash(response.KVs[0].Value)
-		}
 	}
+
+	if len(response.KVs) == 0 {
+		return "nil"
+	}
+	return describeValueOrHash(response.KVs[0].Value)
 }
 
 func describeValueOrHash(value ValueOrHash) string {

tests/robustness/model/deterministic.go

@@ -96,12 +96,11 @@ func (s EtcdState) Step(request EtcdRequest) (EtcdState, MaybeEtcdResponse) {
 		if request.Range.Revision == 0 || request.Range.Revision == s.Revision {
 			resp := s.getRange(request.Range.RangeOptions)
 			return s, MaybeEtcdResponse{EtcdResponse: EtcdResponse{Range: &resp, Revision: s.Revision}}
-		} else {
-			if request.Range.Revision > s.Revision {
-				return s, MaybeEtcdResponse{Error: EtcdFutureRevErr.Error()}
-			}
-			return s, MaybeEtcdResponse{PartialResponse: true, EtcdResponse: EtcdResponse{Revision: s.Revision}}
 		}
+		if request.Range.Revision > s.Revision {
+			return s, MaybeEtcdResponse{Error: ErrEtcdFutureRev.Error()}
+		}
+		return s, MaybeEtcdResponse{PartialResponse: true, EtcdResponse: EtcdResponse{Revision: s.Revision}}
 	case Txn:
 		failure := false
 		for _, cond := range request.Txn.Conditions {
@@ -148,7 +147,7 @@ func (s EtcdState) Step(request EtcdRequest) (EtcdState, MaybeEtcdResponse) {
 			}
 		}
 		if increaseRevision {
-			s.Revision += 1
+			s.Revision++
 		}
 		return s, MaybeEtcdResponse{EtcdResponse: EtcdResponse{Txn: &TxnResponse{Failure: failure, Results: opResp}, Revision: s.Revision}}
 	case LeaseGrant:
@@ -174,7 +173,7 @@ func (s EtcdState) Step(request EtcdRequest) (EtcdState, MaybeEtcdResponse) {
 		//delete the lease
 		delete(s.Leases, request.LeaseRevoke.LeaseID)
 		if keyDeleted {
-			s.Revision += 1
+			s.Revision++
 		}
 		return s, MaybeEtcdResponse{EtcdResponse: EtcdResponse{Revision: s.Revision, LeaseRevoke: &LeaseRevokeResponse{}}}
 	case Defragment:
@@ -193,7 +192,7 @@ func (s EtcdState) getRange(options RangeOptions) RangeResponse {
 		for k, v := range s.KeyValues {
 			if k >= options.Start && k < options.End {
 				response.KVs = append(response.KVs, KeyValue{Key: k, ValueRevision: v})
-				count += 1
+				count++
 			}
 		}
 		sort.Slice(response.KVs, func(j, k int) bool {
@@ -315,7 +314,7 @@ type MaybeEtcdResponse struct {
 	Error           string
 }
 
-var EtcdFutureRevErr = errors.New("future rev")
+var ErrEtcdFutureRev = errors.New("future rev")
 
 type EtcdResponse struct {
 	Txn         *TxnResponse

tests/robustness/model/replay.go

@@ -111,9 +111,8 @@ type Event struct {
 func (e Event) Match(request WatchRequest) bool {
 	if request.WithPrefix {
 		return strings.HasPrefix(e.Key, request.Key)
-	} else {
-		return e.Key == request.Key
 	}
+	return e.Key == request.Key
 }
 
 type WatchRequest struct {

tests/robustness/traffic/etcd.go

@@ -161,7 +161,7 @@ func (c etcdTrafficClient) Request(ctx context.Context, request etcdRequestType,
 	opCtx, cancel := context.WithTimeout(ctx, RequestTimeout)
 	defer cancel()
 
-	var limit int64 = 0
+	var limit int64
 	switch request {
 	case StaleGet:
 		_, rev, err = c.client.Get(opCtx, c.randomKey(), lastRev)

tests/robustness/traffic/kubernetes.go

@@ -114,7 +114,7 @@ func (t kubernetesTraffic) Read(ctx context.Context, kc *kubernetesClient, s *st
 	hasMore := true
 	rangeStart := keyPrefix
 	var kvs []*mvccpb.KeyValue
-	var revision int64 = 0
+	var revision int64
 
 	for hasMore {
 		readCtx, cancel := context.WithTimeout(ctx, RequestTimeout)